matthew/The-Powder-Toy
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Fix stuttering issue with FPS cap

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This commit is contained in:
Simon Robertshaw 2012-10-05 14:21:38 +01:00
parent 707c11203e
commit 4bb402f4fd
1 changed files with 22 additions and 30 deletions
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52
src/PowderToySDL.cpp
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@ -296,6 +296,9 @@ ui::Engine * engine = NULL;
void EngineProcess()
{
int frameStart;
float frameTime;
float frameTimeAvg = 0.0f, correctedFrameTimeAvg = 0.0f;
SDL_Event event;
while(engine->Running())
{
@ -363,13 +366,30 @@ void EngineProcess()
}
if(engine->Broken()) { engine->UnBreak(); break; }
frameStart = SDL_GetTicks();
engine->Tick();
engine->Draw();
frameTime = SDL_GetTicks() - frameStart;
if(SDL_GetTicks()-lastTick>250)
frameTimeAvg = (frameTimeAvg*(1.0f-0.2f)) + (0.2f*frameTime);
if(ui::Engine::Ref().FpsLimit > 2.0f)
{
float targetFrameTime = 1000.0f/((float)ui::Engine::Ref().FpsLimit);
if(targetFrameTime - frameTimeAvg > 0)
{
SDL_Delay((targetFrameTime - frameTimeAvg) + 0.5f);
frameTime = SDL_GetTicks() - frameStart;//+= (int)(targetFrameTime - frameTimeAvg);
}
}
correctedFrameTimeAvg = (correctedFrameTimeAvg*(1.0f-0.05f)) + (0.05f*frameTime);
fps = 1000.0f/correctedFrameTimeAvg;
engine->SetFps(fps);
if(frameStart-lastTick>250)
{
//Run client tick every second
lastTick = SDL_GetTicks();
lastTick = frameStart;
Client::Ref().Tick();
}
@ -387,34 +407,6 @@ void EngineProcess()
else
blit(engine->g->vid);
#endif
currentFrame++;
currentTime = SDL_GetTicks();
elapsedTime = currentTime - lastTime;
if(ui::Engine::Ref().FpsLimit > 2.0f && (currentFrame>2 || elapsedTime > 1000*2/ui::Engine::Ref().FpsLimit) && elapsedTime && currentFrame*1000/elapsedTime > ui::Engine::Ref().FpsLimit)
{
while (currentFrame*1000/elapsedTime > ui::Engine::Ref().FpsLimit)
{
SDL_Delay(1);
currentTime = SDL_GetTicks();
elapsedTime = currentTime-lastTime;
}
}
if(elapsedTime>=1000)
{
fps = (((float)currentFrame)/((float)elapsedTime))*1000.0f;
currentFrame = 0;
lastTime = currentTime;
if(ui::Engine::Ref().FpsLimit > 2.0f)
{
delta = ui::Engine::Ref().FpsLimit/fps;
}
else
{
delta = 1.0f;
}
}
engine->SetFps(fps);
}
#ifdef DEBUG
std::cout << "Breaking out of EngineProcess" << std::endl;